Wayne Parham Messages: 18752 Registered: January 2001
Illuminati (33rd Degree)
I've seen that white residue from adhesive too. It's really common from super glue.
As for the port, it won't change the SPL significantly but it does change the possibility of a pressure node lining up with it. Of course, if you're changing box dimensions, you'll need to check the lower midrange anyway, so that's just part of it.